65 lines
2.0 KiB
Go
65 lines
2.0 KiB
Go
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// Copyright 2018 Google LLC. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expr
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import (
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"fmt"
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"github.com/google/nftables/binaryutil"
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"github.com/mdlayher/netlink"
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"golang.org/x/sys/unix"
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)
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type ExthdrOp uint32
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const (
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ExthdrOpIpv6 ExthdrOp = unix.NFT_EXTHDR_OP_IPV6
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ExthdrOpTcpopt ExthdrOp = unix.NFT_EXTHDR_OP_TCPOPT
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)
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type Exthdr struct {
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DestRegister uint32
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Type uint8
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Offset uint32
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Len uint32
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Flags uint32
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Op ExthdrOp
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SourceRegister uint32
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}
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func (e *Exthdr) marshal() ([]byte, error) {
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data, err := netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_EXTHDR_SREG, Data: binaryutil.BigEndian.PutUint32(e.SourceRegister)},
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{Type: unix.NFTA_EXTHDR_TYPE, Data: []byte{e.Type}},
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{Type: unix.NFTA_EXTHDR_OFFSET, Data: binaryutil.BigEndian.PutUint32(e.Offset)},
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{Type: unix.NFTA_EXTHDR_LEN, Data: binaryutil.BigEndian.PutUint32(e.Len)},
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// TODO: these fields seem to be conditional?
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//{Type: unix.NFTA_EXTHDR_DREG, Data: binaryutil.BigEndian.PutUint32(e.DestRegister)},
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//{Type: unix.NFTA_EXTHDR_FLAGS, Data: binaryutil.BigEndian.PutUint32(e.Flags)},
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{Type: unix.NFTA_EXTHDR_OP, Data: binaryutil.BigEndian.PutUint32(uint32(e.Op))},
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})
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if err != nil {
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return nil, err
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}
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return netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_EXPR_NAME, Data: []byte("exthdr\x00")},
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{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
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})
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}
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func (e *Exthdr) unmarshal(data []byte) error {
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return fmt.Errorf("not yet implemented")
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}
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